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Leptauchenia major

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Leptauchenia major was named by Leidy (1856). It is a 3D body fossil. Its type locality is Eagle Nest Butte (Brule), which is in an Arikareean terrestrial horizon in the Brule Formation of South Dakota.

It was recombined as Pseudocyclopidius major by Schultz and Falkenbach (1968).

Synonyms
Synonymy list
YearName and author
1856Leptauchenia major Leidy p. 163 figs. not figured
1857Leptauchenia major Leidy p. 89
1877Brachymeryx feliceps Cope p. 220
1877Cyclopidius simus Cope p. 221
1884Leptauchenia major Cope p. 546
1884Cyclopidius simus Cope p. 547
1884Cyclopidius emydinus Cope p. 553
1893Cyclopidius incisivus Scott p. 661
1925Leptauchenia densa Loomis
1935Cyclopidius densa Schlaikjer
1937Cyclopidius densa Thorpe
1940Leptauchenia major Scott p. 705
1968Cyclopidius emydinus Schultz and Falkenbach
1968Hadroleptauchenia densa Schultz and Falkenbach
1968Hadroleptauchenia extrema Schultz and Falkenbach
1968Hadroleptauchenia shanafeltae Schultz and Falkenbach
1968Leptauchenia margeryae Schultz and Falkenbach
1968Pseudocyclopidius frankforteri Schultz and Falkenbach
1968Pseudocyclopidius major Schultz and Falkenbach
1996Leptauchenia major CoBabe
1998Leptauchenia major Lander
2007Leptauchenia major Stevens and Stevens p. 158
2008Leptauchenia major Prothero and Sanchez

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
suborderTylopoda()
superfamilyOreodontoidea
familyMerycoidodontidaeThorpe 1923
subfamilyLeptaucheniinaeSchultz and Falkenbach 1940
genusLeptauchenia
speciesmajor

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
W. B. Scott 1893 (Cyclopidius incisivus)Like O. simus, but having two small incisors in each premaxillary; the latter bones also of a different shape from those of the former species.
D. R. Prothero and F. Sanchez 2008Medium to large leptaucheniines (P2-M3 length = 51-62 mm, M1-3 lengths = 34-44 mm, M1-2 lengths = 22-27 mm, and skull lengths = 105-125 mm) with relatively more robust zygomatic arches and larger orbits; teeth hypsodont to very hypsodont; styles on M1-3 and stylids on m1-3 well developed. Contrary to CoBabe’s (1996, p. 578) diagnosis, the presence or absence of the M3 is highly variable in both this species and L. decora.